# import time
#
# print("程序开始～")
# # 让程序睡眠5秒（阻塞）
# time.sleep(5)
# print("程序结束")


# from time import sleep
# print("程序开始～")
# # 让程序睡眠5秒（阻塞）
# sleep(5)
# print("程序结束")


# from time import *
# print("程序开始～")
# sleep(5)
# print("程序结束")


import time as tt
print("程序开始～")
tt.sleep(5)
print("程序结束")

from time import sleep as timeout
print("程序开始～")
timeout(5)
print("程序结束")